Adds a callback to TracingAgent::StartAgentTracing()

chromeos/dbus/fake_debug_daemon_client.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_DBUS_FAKE_DEBUG_DAEMON_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_DEBUG_DAEMON_CLIENT_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 13 matching lines @@
 
   void Init(dbus::Bus* bus) override;
   void DumpDebugLogs(bool is_compressed,
                      base::File file,
                      scoped_refptr<base::TaskRunner> task_runner,
                      const GetDebugLogsCallback& callback) override;
   void SetDebugMode(const std::string& subsystem,
                     const SetDebugModeCallback& callback) override;
   std::string GetTracingAgentName() override;
   std::string GetTraceEventLabel() override;
-  bool StartAgentTracing(
-      const base::trace_event::TraceConfig& trace_config) override;
+  void StartAgentTracing(const base::trace_event::TraceConfig& trace_config,
+                         const StartAgentTracingCallback& callback) override;
   void StopAgentTracing(const StopAgentTracingCallback& callback) override;
   void SetStopAgentTracingTaskRunner(
       scoped_refptr<base::TaskRunner> task_runner) override;
   void GetRoutes(bool numeric,
                  bool ipv6,
                  const GetRoutesCallback& callback) override;
   void GetNetworkStatus(const GetNetworkStatusCallback& callback) override;
   void GetModemStatus(const GetModemStatusCallback& callback) override;
   void GetWiMaxStatus(const GetWiMaxStatusCallback& callback) override;
   void GetNetworkInterfaces(
@@ skipping 33 matching lines @@
   bool service_is_available_;
   std::vector<WaitForServiceToBeAvailableCallback>
       pending_wait_for_service_to_be_available_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeDebugDaemonClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_DEBUG_DAEMON_CLIENT_H_